The battery is a device, which has a limited life, usually, two - three years. Replacing the inevitable, and quite expensive. To know, how to buy a battery should get a little deeper into the topic.
Kinds
Most often you can find batteries with a voltage 6AT or 12AT. Currently, the vast majority of the market up batteries 12V dad, slightly less 12V batteries mom . This is due to the needs in the vehicle electrical system. 6V wiring can be found, eg, in old cars, CCTV, smart houses.
Lead-acid batteries
it the most common type of battery. Their design is based on lead-acid electrochemical cells (electrode), soaked with sulfuric acid (electrolyte). They are used in vehicles of any type, the car for golf to trucks. characterized by relatively low price and satisfactory quality, they choose the vast majority of drivers. There are two types of:
- managed- batteries , require monitoring condition and quantity of the electrolyte. Measurement and Electrolyte additions made through a system of valves. Batteries of this type is gradually replaced the use of mass, easy to use batteries are maintenance-free.
- Maintenance-free - the design is almost the same, as in previous. The main difference is the sealed housing, prevents evaporation of the electrolyte. This eliminates the need to replenish it. Because of, that while some actions, таких как интенсивная зарядка – может быть подвержен повышенному внутреннему давление, such batteries are equipped with a valve for discharging excess gas. certainly, it can be recommended to all those, who do not know the automotive or simply has no desire to learn knowledge on battery operation.
gel
gel batteries – this batteries, in which the electrolyte is in gel form. This type is characterized by a slightly greater capacity, able to withstand without damage high discharge, than the lead-acid battery, Besides, It can work in almost any position. Thanks to this ideal motorcycles and SUVs. Гелевые аккумуляторы менее чувствительны к ударам и вибрации.
AGM (Absorbent Glass Mat)
The use and characteristics close to gel batteries. However, different design. Instead, it uses a gel fiberglass, which is impregnated with electrolyte. They are smaller in comparison with lead-acid batteries, while maintaining the same capacity. 
Batteries AGM, like gel, more resistant to damage mechanical. Both types are listed expensive , than lead-acid batteries, and, Consequently, They do not have such great popularity. More often, they can be found in the areas of, far from the automobile.
